Racecast

Racecast tells you what you can run. Enter a race or time trial you have done, any distance, any time, and your watch predicts your 5K, 10K, half and marathon, with the training paces that fit your current fitness. Set a goal race and Racecast counts down, compares your target with what you are on for today, and tells you exactly how much faster you need to get.

Three models work side by side: the classic Riegel formula, Daniels' VDOT oxygen model, and a personal model fitted to your own results. That personal model learns your fatigue factor, the number that says whether you hold pace over distance better or worse than the average runner. Before the race, the split plan gives you a target time at every kilometre or mile, with the negative split you choose, and the conditions page tells you what today's heat will cost.

WHAT IT DOES

• Predictions for 5K, 10K, half marathon, marathon and any custom distance
• Three models: Riegel, Daniels VDOT and your personal fatigue factor; Garmin VO2max as a fourth
• Training paces from your fitness: easy, marathon, threshold, interval, repetition
• Goal race with countdown ring, target against prediction, and the percentage still to gain
• Split plan: cumulative target time per km or mile, even or negative split from 1 to 5 percent
• Conditions: today's temperature and humidity and the slowdown they cause
• Fatigue profile: endurance strong, balanced or speed leaning, from your own results
• Fitness chart: VDOT per result, so you see whether training is working
• Results log with edit and delete; recent results weigh more than old ones
• Fast entry: pick a distance, type the time like a microwave clock, say how many days ago
• Kilometres or miles, glance with your predicted time and the days to your race
• English, Dutch, German, French, Spanish

WHAT IT NEEDS

Nothing but your watch and one race result. No phone, no account, no internet.